GitLab

Ensure ca_context_id be initialized to 0 (otherwise the browser will
attempt to use it).

TBR=zmo

Bug: 785599
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: Idcc8b0e6922c9842ecc7462fe93788aa942793db
Reviewed-on: https://chromium-review.googlesource.com/779306Reviewed-by: ccameron <ccameron@chromium.org>
Commit-Queue: ccameron <ccameron@chromium.org>
Cr-Commit-Position: refs/heads/master@{#518368}